Grilled Lobster Tails with a Ruby Red Grapefruit and Tarragon Vinaigrette

piece(s) lobster tails

cup(s) ruby red grapefruit juice

cup(s) extra-virgin olive oil

teaspoon(s) salt

teaspoon(s) shallot minced

teaspoon(s) dijon mustard

tablespoon(s) champagne vinegar

teaspoon(s) white pepper

tablespoon(s) fresh tarragon leaves chopped

paprika

tablespoon(s) salt

tablespoon(s) garlic powder

tablespoon(s) black pepper

tablespoon(s) onion powder

tablespoon(s) cayenne pepper

tablespoon(s) oregeno

tablespoon(s) thyme dried

paprika

salt

garlic powder

black pepper

onion powder

cayenne pepper

dried oregano

dried thyme